[ 38.514781] audit: type=1800 audit(1583753769.781:27): pid=7184 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 38.541214] audit: type=1800 audit(1583753769.811:28): pid=7184 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="startpar" name="ssh" dev="sda1" ino=2417 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 39.092889] audit: type=1800 audit(1583753770.361:29): pid=7184 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 52.381119] IPVS: Creating netns size=2712 id=1 [ 52.386036] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.0.255' (ECDSA) to the list of known hosts. 2020/03/09 11:36:31 parsed 1 programs 2020/03/09 11:36:31 executed programs: 0 [ 60.672523] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 60.685402] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 60.695112] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 60.703416] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 60.712098] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 60.724086] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 60.739643] IPVS: Creating netns size=2712 id=2 [ 60.744416] IPVS: ftp: loaded support on port[0] = 21 [ 60.814964] IPVS: Creating netns size=2712 id=3 [ 60.819882] IPVS: ftp: loaded support on port[0] = 21 [ 60.952076] chnl_net:caif_netlink_parms(): no params data found [ 60.978148] IPVS: Creating netns size=2712 id=4 [ 60.983005] IPVS: ftp: loaded support on port[0] = 21 [ 61.185940] IPVS: Creating netns size=2712 id=5 [ 61.190873] IPVS: ftp: loaded support on port[0] = 21 [ 61.241628] chnl_net:caif_netlink_parms(): no params data found [ 61.294387] bridge0: port 1(bridge_slave_0) entered blocking state [ 61.301111] bridge0: port 1(bridge_slave_0) entered disabled state [ 61.310634] device bridge_slave_0 entered promiscuous mode [ 61.354198] bridge0: port 2(bridge_slave_1) entered blocking state [ 61.361311] bridge0: port 2(bridge_slave_1) entered disabled state [ 61.370855] device bridge_slave_1 entered promiscuous mode [ 61.520293] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 61.549524] IPVS: Creating netns size=2712 id=6 [ 61.552081] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 61.562623] IPVS: ftp: loaded support on port[0] = 21 [ 61.569652] chnl_net:caif_netlink_parms(): no params data found [ 61.882226] bridge0: port 1(bridge_slave_0) entered blocking state [ 61.888848] bridge0: port 1(bridge_slave_0) entered disabled state [ 61.898126] device bridge_slave_0 entered promiscuous mode [ 61.905662] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 61.930762] bridge0: port 2(bridge_slave_1) entered blocking state [ 61.937270] bridge0: port 2(bridge_slave_1) entered disabled state [ 61.946705] device bridge_slave_1 entered promiscuous mode [ 61.953994] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 61.962542] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 62.027133] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 62.071344] chnl_net:caif_netlink_parms(): no params data found [ 62.080334] IPVS: Creating netns size=2712 id=7 [ 62.085159] IPVS: ftp: loaded support on port[0] = 21 [ 62.099198] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 62.147284] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 62.238050] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 62.245762] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 62.434164] bridge0: port 1(bridge_slave_0) entered blocking state [ 62.440922] bridge0: port 1(bridge_slave_0) entered disabled state [ 62.450715] device bridge_slave_0 entered promiscuous mode [ 62.517184] bridge0: port 2(bridge_slave_1) entered blocking state [ 62.523729] bridge0: port 2(bridge_slave_1) entered disabled state [ 62.534809] device bridge_slave_1 entered promiscuous mode [ 62.601914] chnl_net:caif_netlink_parms(): no params data found [ 62.661447] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 62.677364] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 62.706356] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 62.715916] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 62.948648] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 63.039960] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 63.118919] bridge0: port 1(bridge_slave_0) entered blocking state [ 63.125506] bridge0: port 1(bridge_slave_0) entered disabled state [ 63.134993] device bridge_slave_0 entered promiscuous mode [ 63.199462] bridge0: port 2(bridge_slave_1) entered blocking state [ 63.206169] bridge0: port 2(bridge_slave_1) entered disabled state [ 63.215722] device bridge_slave_1 entered promiscuous mode [ 63.298499] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 63.345946] chnl_net:caif_netlink_parms(): no params data found [ 63.361346] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 63.371588] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 63.382877] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 63.621377] bridge0: port 1(bridge_slave_0) entered blocking state [ 63.629025] bridge0: port 1(bridge_slave_0) entered disabled state [ 63.638858] device bridge_slave_0 entered promiscuous mode [ 63.667261] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 63.676497] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 63.742528] bridge0: port 2(bridge_slave_1) entered blocking state [ 63.750334] bridge0: port 2(bridge_slave_1) entered disabled state [ 63.759820] device bridge_slave_1 entered promiscuous mode [ 63.767026] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 63.865723] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 63.874617] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 63.964885] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 64.045119] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 64.129440] bridge0: port 1(bridge_slave_0) entered blocking state [ 64.136598] bridge0: port 1(bridge_slave_0) entered disabled state [ 64.146389] device bridge_slave_0 entered promiscuous mode [ 64.201033] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 64.209357] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 64.216578] bridge0: port 2(bridge_slave_1) entered blocking state [ 64.224518] bridge0: port 2(bridge_slave_1) entered disabled state [ 64.234130] device bridge_slave_1 entered promiscuous mode [ 64.340687] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 64.433883] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 64.465788] ------------[ cut here ]------------ [ 64.471444] WARNING: CPU: 1 PID: 7437 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 64.480328] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 64.487608] Kernel panic - not syncing: panic_on_warn set ... [ 64.487608] [ 64.495128] CPU: 1 PID: 7437 Comm: syz-executor.4 Not tainted 4.6.0-syzkaller #0 [ 64.503067] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.514152] 1ffffffff0d95756 ffff8800b4d06fb0 ffffffff82c74fc6 ffffffff85c81040 [ 64.522393] ffff8800b4d07088 ffffffff85d2bac0 ffffffff81922ccb ffff8800b4d07078 [ 64.530693] ffffffff8160cf4e 0000000041b58ab3 ffffffff868f2161 ffffffff8160cd9f [ 64.539489] Call Trace: [ 64.542216] [] dump_stack+0xe6/0x120 [ 64.548227] [] ? sysfs_warn_dup+0x7b/0xa0 [ 64.554559] [] panic+0x1af/0x348 [ 64.559993] [] ? set_ti_thread_flag+0xf/0xf [ 64.566711] [] ? sysfs_warn_dup+0x7b/0xa0 [ 64.573269] [] __warn+0x18d/0x1b0 [ 64.578852] [] warn_slowpath_fmt+0x92/0xb0 [ 64.586140] [] ? __warn+0x1b0/0x1b0 [ 64.592217] [] ? kernfs_path_from_node+0x4a/0x60 [ 64.599048] [] sysfs_warn_dup+0x7b/0xa0 [ 64.604746] [] sysfs_do_create_link_sd.isra.2+0xd1/0xf0 [ 64.611888] [] sysfs_create_link+0x43/0xb0 [ 64.618298] [] device_add+0x689/0x1360 [ 64.624198] [] ? kfree_const+0x1d/0x20 [ 64.630434] [] ? device_private_init+0x180/0x180 [ 64.637719] [] ? kfree_const+0x1d/0x20 [ 64.643745] [] ? kobject_set_name_vargs+0xb4/0x130 [ 64.651610] [] device_create_groups_vargs+0x1c8/0x220 [ 64.659375] [] device_create+0x88/0xa0 [ 64.665195] [] ? device_create_vargs+0x20/0x20 [ 64.672908] [] ? macvlan_set_mac_address+0x150/0x150 [ 64.680658] [] macvtap_device_event+0x1c4/0x2a0 [ 64.687271] [] notifier_call_chain+0x8b/0x170 [ 64.694179] [] raw_notifier_call_chain+0x11/0x20 [ 64.700942] [] call_netdevice_notifiers_info+0x47/0x80 [ 64.709362] [] register_netdevice+0x88a/0xce0 [ 64.716753] [] ? netdev_change_features+0x80/0x80 [ 64.724809] [] ? dev_get_nest_level+0x10c/0x1a0 [ 64.731775] [] macvlan_common_newlink+0x8b9/0x1090 [ 64.738564] [] macvtap_newlink+0xbf/0x110 [ 64.745033] [] ? __netlink_ns_capable+0xc7/0xf0 [ 64.752159] [] rtnl_newlink+0xd4b/0x1230 [ 64.759135] [] ? rtnl_link_ops_get+0x5d/0x90 [ 64.765611] [] ? rtnl_newlink+0x319/0x1230 [ 64.771494] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 64.779126] [] ? rtnl_setlink+0x2f0/0x2f0 [ 64.787180] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 64.794240] [] ? __lock_acquire+0x1985/0x5560 [ 64.801327] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 64.808949] [] ? set_next_entity+0x301/0x410 [ 64.815385] [] ? __netlink_ns_capable+0xc7/0xf0 [ 64.821956] [] rtnetlink_rcv_msg+0x222/0x680 [ 64.828443] [] ? trace_hardirqs_on_caller+0x44c/0x5e0 [ 64.835483] [] ? rtnetlink_rcv+0x30/0x30 [ 64.841961] [] ? mutex_lock_nested+0x638/0xb30 [ 64.848489] [] ? rtnetlink_rcv+0x16/0x30 [ 64.854480] [] ? netlink_lookup+0xd4/0x630 [ 64.860445] [] netlink_rcv_skb+0x242/0x350 [ 64.866323] [] ? rtnetlink_rcv+0x30/0x30 [ 64.872319] [] rtnetlink_rcv+0x25/0x30 [ 64.878028] [] netlink_unicast+0x455/0x660 [ 64.884484] [] ? netlink_unicast+0x3b5/0x660 [ 64.891050] [] ? netlink_attachskb+0x730/0x730 [ 64.897536] [] netlink_sendmsg+0x893/0xb40 [ 64.904639] [] ? netlink_unicast+0x660/0x660 [ 64.913204] [] ? __might_fault+0xf1/0x1b0 [ 64.919106] [] ? netlink_unicast+0x660/0x660 [ 64.925297] [] sock_sendmsg+0xb5/0xf0 [ 64.930845] [] SYSC_sendto+0x1c9/0x300 [ 64.937163] [] ? SYSC_connect+0x2a0/0x2a0 [ 64.943761] [] ? mntput_no_expire+0xb1/0x600 [ 64.950385] [] ? mntput_no_expire+0xce/0x600 [ 64.956859] [] ? mnt_get_count+0x1c0/0x1c0 [ 64.963548] [] ? mntput+0x52/0x70 [ 64.970359] [] ? ___might_sleep+0x331/0x440 [ 64.976708] [] ? trace_hardirqs_on_caller+0x44c/0x5e0 [ 64.984068] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 64.991169] [] SyS_sendto+0x9/0x10 [ 64.996602] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 65.005761] Kernel Offset: disabled